What should a team member be briefed on when preparing to back up a co-worker prior to discontinuing service?

Question: What should a team member be briefed on when preparing to back up a coworker prior to discontinuing service?
  a mutually agreed upon signal to indicate his or her assistance is required
  an exit strategy if the customer requires assistance out of the establishment
  information relevant to the situation
  knowledge of his or her legal responsibilities to the customer

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information relevant to the situation